Desk operator&#39;s circuits



- w. A. RHODES.

DESK OPERATOR'S CIRCUITS.

APPLICATION FILED DEC.5, 1918.

Patented Sept. 13, 1921:.

INVENTOR.

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ATTORNEY be connected by means (if-suitable switching arrangements; such as listening keys. A plus,

WILLIA A. enemas, OFINEWQYORK, N. Y., assr'enoa TO 'aMErticANrELEPHoNn AND. mnrneearn colar mmaooerozea'rron or ew YORK.

I nnsirornna'rfora's cinoi r'rsl To all whom it may concern: 1 Be it known that 1', WILLIAM A; RHODES, residing at New Yorksin the county of New York and State of New York, have invented certain Improvements in Desk Operators? tomary to provide at information and other desk operators positions equipment including a? plurality of cord. circuits, shown in" the presentinstance as singleended with any one of 'whichan operators telephone set may ra-lity of cordcircuitsare provided at each desk position for. the purpose of .allowing an operator thereat to answerasecondorpa third call and so on, while holding the origi= I nal calls on the firstand second cords used,

since each cord: is provided with a key which may be thrown ina holding position. 7 Itiis necessary at times for thedesk :operatorto use more than one cord, since the call an swered mayrequire aconsiderable period of time to find the informationrequested' and often requires the cooperation of a second operator. During this time it is posslblegtor the desk or special operator to answer other calls and thus decrease the answering time of the various desk operators. Inthe use'of the cord circuitsthe operator, before making 'a connection usually touches the tip of the plug to the jack of the Wanted line for the purpose of ascertaining the condition of said line. If the line is in use, the-operator s so informed by the usual busy test indlcatlons:

For making a so-called busy test, it has been the practice'heretofore to provide a controlling relay and associated testing equipment for each and all ofthe cords. principal objects of this invention is'to provide a system in which the desiredresults may be accomplished by busy testfequipment common to all the cords and also individual- .to the operators set .Other andfurther ob-. V jects of the invention will hereinafter appear. In the accompanylng drawlng, F gure l diagrammatically represents one embodiment of this invention, and Fig. 2'is a modie fication thereof. 1, v 1

One of the Application filed December 5. 1918. Seria1'Noi 265A38 To the the vertical? dotted lines.

1-7-1, 2-2, in Figs; 1 and 12 are shown pli'igs P and 12 eys K and K and other -equip ment associated with individual cords, a phi-J rallty of I which are associated with. Fa com-' mon operators telephone set. To the of 'sald lines are shown such operators? 'sets and busyltest equipment individual to therespective'i sets, the operators sets and equipment belng common toall the cords, r

In connection the following description of the operation of the "embodiment shown inrFig 1 willbe assumedthat con nection 1sdes red witli afline' terminating at.

'jackJ. lf thegoperat'er at A 'actuates the key'K'and in applyin the" tip'of the plu P to the sleeve'of ack'J, to ascertain in the customary manne'rthe condition of the line, receives. a clickin-the receiVer R shewill know-that the line' isb'usy. he path' for current for the busycircuit-maybe tracedx from battery applied through the sleeve of a Cora-in a multiple'ofjack .1 over the mans.

plel connection to the sleeveconta'ct of jack J, tiplconductor of plugP,7cont a'ct 3 of key K, talking conductor lgconductor 4, backcon"-'- tact' 'and armature- 0f relay 5',"-conductor '6,

winding" o f relay '7 to ground: iRela y 7 is thereby energlzed andattra'cts its armature; andprovldesrcurrent for a busy test coil 8' in anobvious manner. Thei currentinduced; in y the busy test c0118 causes a click in there ce1ver' R,aand servesnotice-to-the 'operator that the line is busy, and she thereupon fremoves the tip of'plugP' from contact'with thejack' 'J and the apparatus is restored to normal. Should theiline not be busy, there would beno potential upon any'multiple of the jack J, and the operator,' upon actuating.

the key K and making a busy test, wouldreceiveno click-whereupon she would insert.

the plug Pin the jack J and complete the following circuit: I sleeve 'contact of plug P,- contact 10 .or key K, conductor 11, through the winding of re-' lay.5, to. grounded batter-yn This circuit.- servesxto energize relay 5 which pulls up its; armature, disconnects relay 7 from talking conductor 1, i and breaks the I busy test ci'r cuit previously described.

ground, resistance 9,-

by the cordfishown in Fig. 2, the 0 "erator sleeveof jackJ with the: tip of plug P I would complete a circuit from battery at a a y 5 .Should a'busy test he made for a busy line i busy multiple of jack J over the sleeve of jack J contact 15 of key K talking conductonlG, back contact of relay 17, conductor 18, winding of relay 19 to ground, thus energizing relay 19, which thereupon pulls up its armature and provides'a circuit for test coil 20, the said coil producing a click in the'receiver R thereby informing the operator that the line'is busy, in a manner similar to that described in connection with Fig. 1.

If the line should not be in use, the plug P is inserted in the jack J and the busy test circuit, previously referred to, is broken in a manner. hereinafter described as a result of the energization of relay 21, The circuit for T operating this relay maybe traced from the tip contacts of jack J and plug P contact 15 of'key K talking conductor 16, conductor 22 through the winding of relay 21-, talk in'g conductor 23, contact 2& of said key, and ring contacts of said plug and j ack it being understood that the jack J is associated with a circuit such as a trunk having battery brid ed across its talking conductors. The energization ofrelay 21 pulls up its armature and completes a circuitfrom ground,

armature ofrelay 21, conductor 24, winding f of relay 17 to grounded battery, thereby opcrating relay 1? and causing it to attract its armature, thus breaking the back contact thereof and likewise the busy circuit.

have been illustratedas embodied in certain From the above description it willbe apparent that insteadof employing a relay for each cord for the purpose of disconnecting thebusy test equipment, after a test has been completed, by means of this invention a relaycommon to all thecords'is provided for performing this function with aresulting saving in installation and maintenance.

While the arrangementsof this invention specific arrangements which have been deemed desirable, it will be understood that they are capable of embodiment invmany and widely varied forms without departing from the spirit of the invention as defined in the appended claims. 7

Having thus described my invention, what I desire to secure by Letters Patent is:

1. In a telephone system, a plurality of o erators cords an ooerators tele hone set common to said cords, means to associate said set with any one of said cords, means normally connected with the tip conductors or" said cords to complete a busy test circuit for said set when a test is made with a cord to which the set is connected, and means common to said cords for opening said busy test circuit when a connection is established over said cord. I

2. In a telephone system, a plurality of operators cords, an operators telephone set common to said cords, means toconnect said set with any one of said cords, means normally connected with the tip conductors of said cords to complete a busy test circuit for said set when a test is made with a cord to which theset is connected, andmeansiassociated withsaid set and common to said cords for opening said busy test circuit when a connection is established over said cord.

3. In a telephone system, a plurality of operators cords, an operators telephone set common to saidacords, meansto connect said set with anyone of said cords, means normally connected with the tip conductors of said cords to complete a busy test circuit for said set when a testis made with a cord to which the set is connected, and a relay common to, said cords for openingsaid busy test circuit when a connection is established over a said cord. 1 v

4c. In a telephone system, a plurality'of operators cords, an operators telephone 'set common to said cords, means to connectsaid set with any one of said cords, means normally connected with the tip conductor-sot with any one of said cords, means normally connected with the tip conductors of said cords tocomple'te a busy'test circuit for said: set where a test is made with a cord and the operators set is connected thereto, means common to said cords to open said busy test circuit when a connection is established' over a cord and the operators set is connected thereto, and means toagain prepare saidbusy test circuit when the operators set is, v

disconnected from the cord.

6. In 'a telephone system, :a plurality of operators cords, an operators telephone set common thereto, means to connect said set with any one of said cords, means normally connected with the tip conductors of said cords to complete a busytest-circuit for said set when a testis made with a cord and the operators set is connected thereto, relay means common to said cords to; open said busy test circuit when a conne'ction is estab lished over a cord and the operators set is connected thereto, and means to againpre pare said busy test circuit when the opera-c tors set is disconnected from the cord.

' 7, In a telephone system, a plurality of operators cords, an operators telephoneset common thereto, means to connect said set with any of said cords,"a relay normally connected with the tip conductors of said cords, to complete a busy test circuit for said set when the tip conductor of the plug of a cord is associated with the sleeve conductor of a jack and the operators set is connected "to i 5 operators cords, anoperators telephone set plug is inserted in the jack.

said cord; and means common to said'eords is associated with the sleeve conductor-"of a to open the busy test circuit when-the plug jack and the operators set is connected 'toj v is inserted in the jack. I j I said cord, and relay means common to said 8.111 a telephone system, a plurality of cords to open the busy test circuit whenthe commonthereto, means to connect said set In, testimony whereof ,I have. signed my with any of said cords, a" relay normally conname tothis specificationthis third day of nected with the tip conductors of saidcords December- 1918. v v e. to completea busy test circuitfor said set I 10 when the tip conductor of the plug of a cerd I ILLIAM A. 1, v 

